Franklin Graham explains it all for you:
"Well, you know, you can be born a Muslim, you can be born a Jew, but you can't be born a Christian," said Graham. "The only way you can become a Christian is by confessing your sins to God, asking his forgiveness, and by receiving Jesus Christ by faith into your heart, that Christ died for your sins, shed his blood on Calvary's Cross, and that God raised him to life. If you're willing to accept that and believe that, and let Jesus Christ be the lord of your life, God will forgive your sins, he will heal your heart, and that's the only way you can become a Christian. And so if the President has done that, then I would say he's a Christian, if that's what he has done."He's on sound theological ground here. You can't be "born" a Christian. That's the basis of Kierkegaard's "Attack upon 'Christendom:'" that the individual must make a choice to be a Christian disciple, that it is not a birthright, or the consequent of being born into the right country or culture. But that means something else, too.
It means Franklin Graham has proven that America is not, and cannot be, a "Christian nation." Because Christianity must always be the choice of the individual. It can never be the inheritance of the group. If there is no "Christian seed," there is no Christian nation. There is simply a nation in which Christians, among others, dwell.